The beta-decay of 22Al

In an experiment performed at the LISE3 facility of GANIL, we studied the decay of 22Al produced by the fragmentation of a 36Ar primary beam. A beta-decay half-life of 91.1 +- 0.5 ms was measured. The beta-delayed one- and two-proton emission as well as beta-alpha and beta-delayed gamma decays were measured and allowed us to establish a partial decay scheme for this nucleus. New levels were determined in the daughter nucleus 22Mg. The comparison with model calculations strongly favours a spin-parity of 4+ for the ground state of 22Al

Spectroscopic factor and proton formation probability for the d3/2 proton emitter 151mLu

The quenching of the experimental spectroscopic factor for proton emission from the short-lived d3/2 isomeric state in 151mLu was a long-standing problem. In the present work, proton emission from this isomer has been reinvestigated in an experiment at the Accelerator Laboratory of the University of Jyväskylä. The proton-decay energy and half-life of this isomer were measured to be 1295(5) keV and 15.4(8) μs, respectively, in agreement with another recent study. These new experimental data can resolve the discrepancy in the spectroscopic factor calculated using the spherical WKB approximation. Using the R-matrix approach it is found that the proton formation probability indicates no significant hindrance for the proton decay of 151mLu

Sauget Plant Flare Gas Reduction Project

Empirical analysis of stack gas heating value allowed the Afton Chemical Corporation Sauget Plant to reduce natural gas flow to its process flares by about 50% while maintaining the EPA-required minimum heating value of the gas streams

Transmission of fast molecular ions through thin foils

New results on the transmission of fast molecular ions through thin foils are presented and a mechanism for the transmission process is proposed. The main feature of the postulated mechanism is that a finite fraction of the incident molecular beam does not undergo a strong Coulomb explosion while traversing the foil. Because the emerging fragments are at large internuclear separations, there is an enhanced probability for the formation of bound, long-range, excited electronic states following electron capture at the rear surface of the target

Effects seen in the interactions of fast molecular-ion beams with matter. [Angular distributions, dissociation, polorization, energy losses, transmitted fractions]

Experimental results are presented from high resolution studies of the energy- and angle-distributions for the break-up products that arise from the dissociation of a variety of fast molecular ions in thin carbon foils and in gases. The results for foil targets are compared with calculations based on a model for the polarization ''wakes'' induced in foils by the passage of fast charged projectiles. An example is given of the application of this type of dissociation measurement to the determination of a molecular structure--that of H/sub 3//sup +/. Also measurements on the transmission of fast molecular ions through carbon foils are described and results presented on the transmission probabilities, energy losses and angular distributions of the transmitted ions

Channeling of positive and negative pions in a silicon crystal

The channeling characteristics for 70.5-MeV and 255-MeV ..pi../sup +/ and ..pi../sup -/ traversing a 120-..mu.. thick silicon crystal have been measured. The energy loss for channeled ..pi../sup +/ is about /sup 2///sub 3/ that obtained for ''random'' incidence, while that for channeled ..pi../sup -/ is slightly (approximately 10 percent) higher. For both ..pi../sup +/ and ..pi../sup -/ strong steering effects are observed under axial channeling conditions. Similar steering effects are seen in planar channeling for ..pi../sup +/ but not for ..pi../sup -/. The results suggest there is a high probability for ..pi../sup -/ to be captured into classical trajectories that spiral around the rows of atoms in the crystal